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W. F. McDONALD\ ANGLE GAGE.

APPLICATION FILED JUNE 1. 1919.

Patented .Dec. 9,1919.

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UNITED STATES PATENT OFFICE.

WILLIAM F. 'MQIDONALD, OF MADISON, WISCONSIN.

ANGLE-GAGE.

To all whom it may concern:

Be it known that I, WILLIAM F. Mo-

DONALD, a citizen of the United States, re- 7 siding at Madison, in the'county of Dane and State of Visconsin, have invented new and useful Improvements in Angle-Gages, of which thefollowing is a specification.

This invention relates to geometrical instruments, particularly to angle gages, and has for its object the provision of an angle gage adapted to facilitate the finding of any conceivable angle atone setting and particularly adapted for use in connection with grinders, milling 'machines, planers, drlll presses, and the like. 1 7

An important and more specific object is the provision of a gage of this character including I a base member having pivotally mounted thereon a second member carrying graduations whereby any desired angle in one plane may be ascertained, this second member having pivotally connected therewith a vertical member and provided at the pivot point with graduations whereby any desired angle in another plane may be ascertained, this vertical member having p1votally connected therewith a right angular arm carrying graduations adjacent the pivot point'whereby anydesired angle in still another plane ma be determined.

A further ob ect is the provision of a device of this character in which certain of the parts may be clamped in adjustedposition.

An additional object is the provision of a device of this character which will be simple and inexpensive in manufacture, highly efiicient in use, durable in service, and a general improvement in the art. 7

lVith the above and other objects and advantages in view, the invention consists in the details of construction to be hereinafter more fully described and claimed, and illustrated in the accompanying drawing, in which Figure 1 is a side elevation of the device,

Fig. 2 is a front elevation, and

Fig. 3 is a rear elevation.

Referring more particularly to the drawing, the numeral 10 designates the top piece of the device which is formed preferably as a rigid right angular member having its upper arm 11 provided with suitable slots or holes for clamping upon a vise or fixture, not shown. The other arm 12 of the member 10 has formed centrally thereon and extending from its outer face a boss 13 which termi- Sp ecification of lLetters I'atent.

Patented Dec.- 9, 1919.

Application filed June 7, 1919. Serial No. 302,430.

nates in a reduced extension 14 which is threaded. At its lower portion, the arm 12 is formed semicircular and beveled, as shown at 15, the curvature of this edge being concentric with the center of the boss 13. The beveled surface 15 is further graduated from zero to 180 and these graduations are sub-* divided into minutes and also seconds if the size of the device will permit. Ifdesired, the junctureof the upper arm 11 with the arm 12 might be hinged, though this structure is not shown.

The numeral 16 designates a baseplate which carries at one end the pointer 17 and which is provided upon its upper face with a boss 18 terminating in a reduced threaded extension 19.

Disposed upon the base 16 isa member 20 including a lower arm 21 having a hole snugly receiving the boss 18 and having its end portion formed semicircular and beveled, as shown at 22, the curvature of this portion being concentric'with the center of the boss 18. This beveled surface 22 has inscribed thereon graduations indicating de-' and these knuckles bear upon their outer faces graduations indicating degrees andv minutes and which range from zero to 180.

Associated with'the arm 21 is an arm 27' which'is provided at its lower end with a hinge knuckle 28 disposed between the knuckles 25 and pivotally mounted therebetween by means of a pintle 29. The inner edge of the arm 27 is adapted for cooperation with the graduations on the knuckles 15 for setting the arm 27 at any desired angular position with relation to the arm 21. At its upper end, the arm 27 is provided with a circular hole 30 snugly receiving the boss 13 carried by the arm 12. A washer 31 is disposed upon the reduced extension 14 and is engaged by a clamping nut 32 threaded upon the reduced extension 14 whereby operating with the graduations on the beveled surface 15 of the arm 12 whereby the member 10 may be set at any desired adjustment.

In the operation of the device, it will be observed that the member 10 is rigidly secured within a vise or fixture, that by loosening the nut 32 the arm 27 of the member 20 may be set at any desired angular position with respect to the arm 12 of the memberlf) and may be held in such position by tightening the nut 32. The arm 21 of the member 20 may then be swung upon the pintle 19 to be disposed at any c esired angle with respect to the arm By loosening the nut 24, the base plate 16 may be moved to any desired angular position upon the lower face of the arm 21 and heldin such position by tightening the nut :24.

From the foregoing description and a study of the drawing it will be apparent that I have thus provided a simple device for the purpose specified which may be quickly and easily adjusted in all of its various parts, which will be simple in operation, accurate in use, and not likely to get out of order.

While I have shown and described the preferred embodiment of my invention, it is of course to be understood that I reserve the rightto make such changes in the form, construction, and arrangement of parts as will not depart from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. A device of the character described comprising a member formed of right angularly extending arms and adapted to be held in fixed position, one arm of said memher having a semicircular end beveled and provided with graduations and degrees, a

boss extending from the outer side of said hole, beveled, and provided with gradua-- tions indicating degrees, a base plate disposed beneath said last named arm, a boss extending upwardly from said base plate and journaled within said last named hole, and means for clamping said base plate with respect to said last named arm.

2. A device of the character described comprising a member formed of right angularly extending arms and adapted for engagement within a vise, a second member pivotally connected with one arm of said first named member, means by which said last named arm may be adjusted upon said member, a hinge knuckle formed on the lower end of said last named arm. another arm provided at one end 7 with hinge knuckles pivotally connected with said first named hinge knuckles, and a base plate pivotally connected with said last named arm and adjustable with respect thereto,

In testimony whereof I afiiX my signature.

WILLIAM F. MCDONALD. 

